In the Netherlands, the introduction of screening for colorectal cancer is being considered. CT colonography is an accurate technique for the detection of colorectal cancer and its precursors in symptomatic patients and for screening. Radiation exposure in CT colonography is limited and is no major drawback for the use of CT colonography for screening. Aspects important to screening with CT colonography have not been studied yet, such as participation rate and cost effectiveness. MR colonography for screening has been studied little.